Two-wheeled motor vehicle brake control method and system

Abstract

To reliably control and prevent rear wheel lifting caused by an abrupt brake operation. An amount of change in vehicle body deceleration is computed on the basis of detection signals of wheel velocity sensors 45 and 46 (S 102 ), it is determined whether or not that computed value exceeds a predetermined value K 1 (S 104 ), and when it is determined that the computed value exceeds the predetermined value K 1 , then it is determined that there is the potential for rear wheel lifting, reduction of a pressure increase gradient of wheel cylinder pressure is performed (S 106 ) until the amount of change in vehicle body deceleration falls below the predetermined value K 1 , and lifting of the rear wheel is reliably controlled.

1 - 25 . (canceled) 
   
   
       26 . A two-wheeled motor vehicle brake control method comprising:
 determining whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value; and   reducing a pressure increase gradient of wheel cylinder pressure when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       27 . A two-wheeled motor vehicle brake control method comprising:
 determining whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value; and   maintaining wheel cylinder pressure at a constant pressure when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       27 . A two-wheeled motor vehicle brake control method comprising:
 determining whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value; and   reducing wheel cylinder pressure by a certain amount when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       28 . The two-wheeled motor vehicle brake control method of  claim 27 , wherein when it is determined that the predetermined parameter exceeds the predetermined value, then it is determined whether or not skidding is occurring in a front wheel, and when it is determined that skidding is occurring in the front wheel, then wheel cylinder pressure is reduced by a certain amount. 
   
   
       29 . The two-wheeled motor vehicle brake control method of claim  25 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       30 . The two-wheeled motor vehicle brake control method of  claim 26 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       31 . The two-wheeled motor vehicle brake control method of  claim 27 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       32 . The two-wheeled motor vehicle brake control method of  claim 28 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       33 . The two-wheeled motor vehicle brake control method of claim  25 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       34 . The two-wheeled motor vehicle brake control method of  claim 26 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       35 . The two-wheeled motor vehicle brake control method of  claim 27 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       36 . The two-wheeled motor vehicle brake control method of  claim 28 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       37 . A two-wheeled motor vehicle brake control system configured to be capable of transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system, capable of transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, and capable of discharging brake fluid of the front wheel cylinder to a front reservoir as desired.
 wherein the brake control system is configured to determine whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value, and   discharge the brake fluid of the front wheel cylinder such that a pressure increase gradient of the front wheel cylinder pressure becomes smaller when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       38 . A two-wheeled motor vehicle brake control system configured to be capable of transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system, capable of transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, and capable of discharging brake fluid of the front wheel cylinder to a front reservoir as desired,
 wherein the brake control system is configured to determine whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value, and   block off communication between the front brake master cylinder and the front wheel cylinder and maintain the front wheel cylinder pressure at a constant pressure when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       39 . A two-wheeled motor vehicle brake control system configured to be capable of transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure systems capable of transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, and capable of discharging brake fluid of the front wheel cylinder to a front reservoir as desired,
 wherein the brake control system is configured to determine whether or not the value of a predetermined parameter that has been preselected as an index for predicting the potential for lifting of a rear wheel exceeds a predetermined value, and   discharge the brake fluid of the front wheel cylinder such that the front wheel cylinder pressure is reduced by a certain amount when it has been determined that the predetermined parameter exceeds the predetermined value.   
   
   
       40 . The two-wheeled motor vehicle brake control system of  claim 39 , wherein the brake control system is configured such that, when it is determined that the predetermined parameter exceeds the predetermined value then the brake control system determines whether or not skidding is occurring in the front wheel, and when it is determined that skidding is occurring in the front wheel, then the brake control system reduces the front wheel cylinder pressure by a certain amount. 
   
   
       41 . The two-wheeled motor vehicle brake control system of  claim 37 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       42 . The two-wheeled motor vehicle brake control system of  claim 38 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       43 . The two-wheeled motor vehicle brake control system of  claim 39 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       44 . The two-wheeled motor vehicle brake control system of  claim 40 , wherein the predetermined parameter is vehicle body deceleration or an amount of change in vehicle body deceleration. 
   
   
       45 . The two-wheeled motor vehicle brake control system of  claim 37 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       46 . The two-wheeled motor vehicle brake control system of  claim 38 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       47 . The two-wheeled motor vehicle brake control system of  claim 39  wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       48 . The two-wheeled motor vehicle brake control system of  claim 40 , wherein the predetermined parameter is wheel cylinder pressure or an amount of change in wheel cylinder pressure. 
   
   
       49 . A two-wheeled motor vehicle brake control system that features the structure made so as to determine a possibility of rear-wheel lifting when the pressure of the front-wheel cylinder, which is detected by a pressure sensor, becomes or exceeds the prescribed value.